Burner for liquid fuels



Aug. 17, 1937. c. PULEJO ET AL 2,090,267

BURNER FOR LIQUID FUELS Filed Sept. 25, 1956 INVENTORS. CARLO PUL.EJO

JEAN STAUB Patented Aug. 17, 1937 PATENT OFFICE BURNER FOR LIQUID FUELSCarlo Pulejo, Lausanne, and Jean Staub, Pully-Lausanne, SwitzerlandApplication September 25, 1936, Serial No. 102,580 In Switzerland August24, 1935 1 Claim.

This invention relates to a burner for liquid fuels.

In the improved burner, which is of simple and sturdy construction nomaterial other than metal is employed at all points where such othermaterials may develop defects by contact with the liquid.

The annexed drawing illustrates an example of construction of theinvention.

Fig. l is a vertical longitudinal section of a diffuser adapted to beattached to a casing which encloses the assembly of control members.

Fig. 2 is a vertical longitudinal section of the casing, to which thediffuser of Fig. 1 is to be attached.

Fig. 3 illustrates on a larger scale in end view the fuel sprayingnozzle.

Fig. 4 is a rear elevation, on a smaller scale, of the assembled burner.

The diluser is adapted to be connected to the casing 2 by means of boltsI and the nozzle comprises a conical valve body 3, the rod 5 of which isadjustable within a fuel supply tube l. Tube l has external vanes 6 incontact with the inner walls of a tubular nozzle l. Rod 5 is alsoprovided with vanes in contact with the interior of the fuel supply tube4.

The atomizing agent, for example air, and the fuel are fed to the burnerby known means, the former through a duct 8 and the latter through aduct 9 The duct 8 communicates with the free space between the nozzle iand the tube 4, while the duct 9 communicates with the free spacebetween the tube 6 and the rod 5 of the valve body 3. The base of theconical valve body 3 is of larger diameter than its rod 5. The rod 5 maybe screwed more or less into the fixed stuffing box member lll, so as toallow of simultaneous adjustment of the flow of fuel and the flow of theair, the position of the nozzle l and of an air intake cone ll beingfixed during manufacture. This atomizing nozzle gives very good results.The oil flows all round the rod of the conical valve body 3 and the airfrom the duct 8 passes all round the point of the valve body 3.

At 15 (Fig. 1) and at I6 (Fig. 2) bafile devices are disposed adapted tovery considerably reduce the noise incidental to the operation of theburner. Each of these devices comprises two groups of bales, which maybe adjusted more or less closely to one another. One group of bafilesare adjustably secured to the diffuser by screws Il and l8 which passthrough slots in the flange l9, the slots being eccentrically disposedso as to cause the flange to move longitudinally when the same isrotated through a certain angle.

At 20 (Fig. 2) an aperture is formed which is useful for reaching themembers to be adjusted during mounting, this aperture being adapted tobe covered by a metal band 20 retained in position by elasticity.

For the automatic operation of the burner elec tromagnets 2| and 22 areprovided which cause a lever 23 to rock in one direction or the otherunder the action of a thermostat having a mechanical control device ofany known construction. The movement of the lever 23 results in thethreaded rod 5 of the valve body 3 being rotated in one direction or theother by means of connecting rods 24, 25, whereby the supply of air andfuel is automatically controlled. The arrangement is such that thesupply of fuel is never cut off completely, so that instead of beingextinguished the burner operates with a pilot flame. This is easilyarranged by means of an abutment corresponding to the minimum fuelsupply. A further abutment may correspond to the maximum fuel supply soas to avoid a predetermined calorific capacity from being exceeded.

Where the control is not automatic and is effected by hand, it isadvisable to completely close the fuel outlet when shutting down, so asto avoid fuel leakage.

What we claim as our invention and desire to secure by Letters Patent ofthe United States is A device of the character described, comprising incoaxial disposition a conical valve body, a shaft therefor, a fuelsupply tube surrounding and spaced from said shaft, a nozzle tubesurrounding and spaced from said fuel supply tube. said nozzle tubehaving its outlet end constricted to form a conical seat for saidconical valve body, the outlet end of said fue] supply tube being spacedfrom the conical seat of the nozzle tube to provide a flow path for afluid between said nozzle tube and the fuel supply tube, means forintroducing liquid fuel into said fuel supply tube about said shaft,means for introducing a spraying medium between said fuel supply tubeand said nozzle tube, the said conical valve body having a base ofgreater diameter than that of said shaft, so that fuel flows all aroundsaid base and flows together with the atomizing agent between the saidvalve body and said seat, the base of said valve body being ofsubstantially the same diameter as that of the fuel supply tube, andmeans for moving said shaft and said valve body axially between the seaton the nozzle tube and the end of the fuel supply tube to regulate theflow of fuel and atomizing medium.

CARLO PULEJO. JEAN STAUB.

